Pitman



R. R. BLOSS.

PITMAN.

APPLICATIQN FILED APR. 6, 1921.

Patented Nov. 7, 1922.

Patented Nov, 7, 1922.

ra sin PATENT easier,

BIGHARD RALPH BLOSS, OF PARKERSBURG, WEST VIRGINIA, ASSIGNOR TC) THE PARKERSBUBG RIG 8c REEL COMPANY, OF PARKERSBURG, WEST VIRGINIA,

CORPORATION OF WEST VIRGINIA.

PITMAN.

Application filed April 6, 1921. Serial No. 459,062.

To all whom it may concern:

Be it known that I, RICHARD It. BLoss a citizen of. the United States, residing at Parkersburg, in the county of Wood and State of West Virginia, have invented certain new and useful Improvements in Pitmen, of which the following isa specification.

This invention relates to pitmen, and more particularly to a pitman having a wrist pin bearing or housing which may be adjusted to various angles with respe'ctto the axis of the pitman.

The,.pitman on a drilling machine or a drilling rig which connects the walking beam to the crank frequently has to be adjusted because the walking beam is not at right anglesto the crank shaft. In the pres entinvention, I have provided a construction'wherein a wrist pin bearing or housing which is adapted toreceive the wrist pin of the crank shaft, may be rotated on the pitman to permit proper adjustment to machines wherein the walking beam and crank.

therefor are arranged at various angles. 1 further provide a removable bearing for the wrist pin which may be replaced without replacing the other parts of the pitman and which may be adjusted to take up wear. In one form of the invention, I provide a shock absorber arranged in the wrist pin bearing whereby shocks and ars, due to the operation of the machine, are absorbed and not transmitted to the Walking beam. The invention is, of course, applicable to use in other fields where pitmen are employed, and is in no way limited to its use in connection with drilling machines or drilling rigs. The use in connection with drilling machines or drilling rigs is merely a specific embodiment of the invention and is used by Way of illustration.

In the accompanying drawings, I have shown several embodiments of the invention. In this showing:

Figure 1 is a front elevation of one form of the invention,

Figure 2 is a side elevation thereof, showing the wrist pin bearing in. longitudinal section,

Figure 3 is a detail longitudinal section of another form of the invention,

Figure 4: is a similar view of another form of the invention, and,

Figure 5 is a horizontal sectional View on line 55 of Figure 4.

Referring to Figures 1 and 2 of the drawings, the reference numeral 1 designates generally the pitman having a loop 2, arranged at one end for the reception of a walking beam. The walking beam is shown at 3, in Figure 2 of the drawings. The other end of the pitman is provided with an enlargement 4, adapted to be received within a housing comprising a pair of sections 5 and 6. The lower part of the housing sections are suitably shaped for the reception of bearing members and the upper part is provided with a bore for the reception of the pitman. The lower part of the bore is enlarged, as at 7, for the reception of the enlargement a.

A block or follower 8 is arranged in the.

upper part of the housing, adapted to take up the back lash between the wrist pin and the pitman. A bearing block 9 of substantially semicylindrical shape is arranged in the lower part of the housing and the wrist pin (notshown) is adapted to be received between the follower 8 and the bearing block 9. The parts are retained in assembled position by means of a wedge pin 10, adapted to be received between the end of the pitman and the follower 8. l Vhen in assembled. position, the follower and the bearing block are retained in position by means of flanges 11, formed on the sides of the housing.

In the form of the invention shown in Figure 3 of the drawings, a coil spring 12 is arranged betwen the enlargement 4, and a shoulder 13, formed by the enlargement 7 in the bore which receives the pitman. It will be apparent that jars and shocks due to the operation of the machine will be absorbed by this spring and not transmitted to the walking beam.

In the form of the invention shown 'in Figure 4 of the drawings, a cushioning member 1dof rubber or other suitable material. is employed in place of the coil spring.

In the various forms of the invention, the sections 5 and 6 of the housing are secured to each other by means of bolts 15 passing through suitable openings and being secured in place by means of nuts 16 (see Fig ure 5). In this view of the drawings, the position of the wrist pin is also illustrated in dotted lines, as at 17.

The operation of the device will be apparent. Referring to Figures 1 and 2 of the drawings, when the walking beam is to be connected to a crank shaft arranged at an angle thereto, the nuts 16 are loosened sufiiciently to permit the wrist pin bearing to revolve on the pitman. When the wrist pin bearing has been arranged in proper position for the reception of the wrist pin, the nuts are tightened and the wrist pin positioned between the bearing block and the follower. The wedge is then replaced and proper connection made. I11 Figure 2 of the drawings, I have illustrated in dotted lines, the position of the upper end of the pitman when turned a quarter of a revolution with respect to the bearing for the reception ofa walking beam arranged substantially parallel to the crank shaft.

The operation of the forms of the invention shown in the other views of the drawings is essentially the same, except that means are provided for absorbing shocks and jars.

It is to be understood that the form of the invention herewith shown and described is to be taken as a preferred example of the same, and that various changes in the shape, size, and arrangement of parts may be re sorted to without departing from the spirit of the invention or the scope of the subjoined claims.

Having thus described my invention, I claim:

1. The combination with a pitman rod having an enlargement formed on one end thereof, of a bearing comprising a pair of members adapted to embrace the end of the pitman rod when assembled, said bearing being provided with an opening for the reception of the pitman rod, the inner end of the opening being enlarged for the reception i of said enlargement, cushioning means arranged in said opening and engaging the enlarged end of the pitman, said bearing being provided with an opening for the reception of a wrist pin, a bearing block arranged in said opening, and a wedge arranged between said enlargement and said bearing block.

2. The combination with a pitman rod having an enlargement formed on one end .1

reception of awrist pin, a bearing block arranged in said opening, and a wedge arranged between enlargement and said bearing block.

In testimony whereof Iafiix'niy signature in presence of two witnesses.

, RICHARD RALPH BLOSS. Witnesses H. L. POSTLEWAIT, E. K. AHRENDT. 

